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Inhibition of cyclin-dependent kinases by olomoucine and roscovitine reduces lipopolysaccharide-induced inflammatory responses via down-regulation of nuclear factor κB.
- Source :
-
Cell Proliferation . Apr2009, Vol. 42 Issue 2, p141-149. 9p. 1 Black and White Photograph, 1 Diagram, 4 Graphs. - Publication Year :
- 2009
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Abstract
- Objectives: Initiation and maintenance of pro-inflammatory reactions elicited by bacterial lipopolysaccharide and/or cytokines in the macrophage lineage have been reported to play a crucial role in acute and chronic pathogenic effects. Whether pro-inflammatory responses triggered by lipopolysaccharide in growth arrested cells differ from those in proliferating cells remains unanswered. Materials and methods: Olomoucine and roscovitine are cyclin-dependent kinase (CDK) inhibitors that prevent progression through the cell cycle. After treatment with CDK inhibitors, expression of pro-inflammatory genes was analysed by reverse transcriptase–polymerase chain reaction. Protein levels of inducible nitric oxide synthase (iNOS) and nuclear factor kappaB (NF-κB) were determined by Western blotting. Promoter activity of iNOS was measured by the luciferase activity assay. Results: In this study we have demonstrated that both olomoucine and roscovitine inhibit cell proliferation and diminish nitric oxide production and cytokine gene expression, in lipopolysaccharide-stimulated murine RAW264.7 macrophages. In addition, olomoucine reduces iNOS promoter activity and alleviates NF-κB transcription activation. After co-transfection with E2F1 interference RNA, suppression of lipopolysaccharide-mediated iNOS promoter activity and NF-κB activation was observed. Furthermore, we demonstrated that olomoucine-induced growth arrested cells reduce expression of the p65 subunit of NF-κB. Conclusions: The findings of this study suggest that inhibition of cell-cycle progression is capable of reducing pro-inflammatory responses via down-regulation of NF-κB. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09607722
- Volume :
- 42
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Cell Proliferation
- Publication Type :
- Academic Journal
- Accession number :
- 36922657
- Full Text :
- https://doi.org/10.1111/j.1365-2184.2009.00584.x